NSObject+LPDynamicIvars.h

/* NSObject+LPDynamicIvars.h created by Lukas Pitschl (@lukele) on Wed 03-Aug-2011 */

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/**
 The following methods extends every object to support additional 
 variables to be added/removed/checked at runtime.
 
 Internally uses associated objects to add this functionality.
 
 TODO: support class variables. (might work already, using objc_getClass(self))
 */
@interface NSObject (LPDynamicIvars)

/**
 Add a variable with value <value> to the object.
 */
- (void)setIvar:(id)key value:(id)value;
/**
 Retrieve the value for a variable.
 */
- (id)getIvar:(id)key;
/**
 Remove an existing variable.
 */
- (void)removeIvar:(id)key;
/**
 Check if a variable is set on an object.
 */
- (BOOL)ivarExists:(id)key;

/**
 Removes every added ivar.
 */
- (void)removeIvars;

@end